Ichthyosaurs had a higher chance of being preserved than did terrestrial creatures because, as Marine animals, they tended to live in environments less subject to erosion.
鱼龙比起陆地的动物有更大的几率被保存下来，因为它们作为海洋动物常生活在腐蚀性较小的环境中。
2
Vegetation is an indispensable part of terrestrial ecosystem, and the increase of vegetation coverage could effectively slow down the occurrence of soil erosion.